Preparation process of anti-fouling protective gloves

Abstract

The invention discloses a preparation process of an anti-fouling protective glove, the glove is prepared from multiple layers of non-woven fabrics, and the outermost layer of the glove is an anti-fouling protective layer; the innermost layer of the glove is prepared by processing fibers with skin-friendly and breathable properties, and the anti-pollution protective layer of the non-woven fabric is prepared from anti-pollution protective fibers through a non-woven fabric preparation process; in the preparation process of the anti-fouling protection fiber, a micro-nano rough surface is formed on the surface of the polyester fiber through alkali decrement treatment, the anchoring force of graphene is enhanced, in addition, alkali liquor partially hydrolyzes ester bonds on the surface of the polyester fiber, carboxyl and hydroxyl are generated, and the surface activity of the polyester fiber is improved; the active sites of the graphene oxide and the polyester fiber are accurately bridged through isocyanate crosslinking; then, graphene oxide is subjected to in-situ reduction through high-temperature hydriodic acid steam to form a compact graphene coating layer, and the fiber surface is endowed with super-hydrophobicity / oleophobicity. A micro-bulge structure is constructed on the surface of the graphene oxide coated fiber, so that the hydrophobicity is synergistically improved.

Description

Technical Field

[0001] This invention belongs to the field of protective glove technology, specifically, it relates to a manufacturing process for a stain-resistant protective glove. Background Technology

[0002] Traditional disposable protective gloves are mostly made of latex, nitrile, or ordinary non-woven fabric. Non-woven gloves, on the other hand, are disposable protective gloves made through processes such as high-temperature melting. They are made of synthetic fibers and are widely used in medical care, laboratory operations, cleanroom environments, beauty and hotel services, and other fields. Non-woven gloves are dustproof, anti-static, breathable, and flexible, while also being oil-resistant and absorbent. They are suitable for short-term basic protection and sterile environments. Compared to protective gloves made of metal wire, nitrile, or latex, non-woven gloves offer a lower level of protection but are lightweight, inexpensive, and better suited for contamination isolation in non-heavy-duty work scenarios.

[0003] Disposable gloves made of non-woven fabrics have poor hydrophobic and oleophobic properties, resulting in insufficient stain resistance and easy penetration by oily stains or chemical liquids. Although multi-layer composite gloves can improve protection, they generally suffer from poor breathability, stiff feel, and weak bonding of functional layers. To solve the above problems, this invention provides the following technical solution. Summary of the Invention

[0004] The purpose of this invention is to provide a manufacturing process for anti-fouling protective gloves, solving the problems of easy contamination and difficulty in cleaning of existing protective gloves during use.

[0005] The objective of this invention can be achieved through the following technical solutions: A type of anti-fouling protective glove, which is made of multiple layers of non-woven fabric, with the outermost layer (the side in contact with the external environment) being an anti-fouling protective layer. The innermost layer of the gloves is made of skin-friendly and breathable fibers, such as cotton fibers. Depending on the requirements, one or more layers of fibers with other properties can be laminated between the two outer layers of the non-woven fabric used to make the gloves. For example, if it is necessary to improve the tensile strength of nonwoven fabric, a layer of polypropylene fiber can be laminated between the two surface layers. The anti-fouling protective layer of the nonwoven fabric is made of anti-fouling protective fibers through a nonwoven fabric manufacturing process; The method for preparing the antifouling protective fiber is as follows: Step 1: First, the polyester fiber is treated with alkaline solution to reduce its weight. After the weight reduction treatment, the polyester fiber is washed with deionized water and then dried for later use. Alkali reduction treatment can erode the surface of polyester fibers, thereby increasing the surface roughness of polyester fibers. In addition, the alkali solution partially hydrolyzes the ester bonds on the surface of polyester fibers to generate carboxyl and hydroxyl groups, thereby increasing the surface activity of polyester fibers. The specific method for reducing the weight of polyester fibers using alkaline solution is as follows: Prepare a sodium hydroxide solution with a mass concentration of 1%-5%, then heat it to 60-80 degrees Celsius, add polyester fibers to it, and completely immerse the polyester fibers in the sodium hydroxide solution for 10-20 minutes.

[0006] Step 2: Prepare graphene oxide dispersion, then add isocyanate to graphene oxide dispersion, stir to dissolve isocyanate, add polyester fiber obtained from step 1 after drying, and react at a temperature of 60-80 degrees Celsius for 3-4 hours. In order to ensure the dispersibility of graphene oxide and polyester fibers during the reaction, the reaction can be carried out under ultrasonic conditions. After the reaction is complete, the solid and liquid are separated, and the resulting fiber material is drained and then dried at a temperature of 40-65 degrees Celsius. In the graphene oxide dispersion, the concentration of graphene oxide is 3-6.8 g / 100 mL. Generally, N,N-dimethylformamide is often used as the dispersion medium for graphene oxide dispersion. The amount of isocyanate added is 16%-35% of the weight of graphene oxide; In this step, since the surface of the alkali-treated polyester fiber and the surface of the graphene oxide are rich in hydroxyl and carboxyl groups, isocyanate can be used as a crosslinking agent to fix the graphene oxide onto the surface of the polyester fiber.

[0007] Step 3: First, prepare the polymer monomer emulsion. Add the polyester fiber with graphene oxide coating prepared in Step 2 to the polymer monomer emulsion. Then add the initiator to the polymer monomer emulsion. After the polymer monomer emulsion has completed polymerization, let it stand for 10-20 minutes. Then filter out the fiber material, drain it, and wash the fiber material with deionized water. After washing, the fiber material is dried at a temperature of 45-65 degrees Celsius.

[0008] The polymer monomer emulsion refers to the state in which monomers are added to form an emulsion before the polymerization reaction is carried out, but before an initiator is added.

[0009] The polymer emulsion formed after polymerization of the polymer monomer emulsion has a solid content of 10%-20%; The polymer emulsion after polymerization can be a polyurethane emulsion, etc. In this step, after adding the fiber material to the polymer monomer emulsion, a polymerization reaction is carried out, which causes nanoparticles to be attached to the surface of the polyester fiber, forming a rough micro-surface, which is beneficial to improving the hydrophobicity of the polyester fiber surface.

[0010] Step 4: Reduce the graphene oxide on the surface of the polyester fiber prepared in Step 3 to obtain graphene, thereby obtaining a stain-resistant and protective fiber with graphene coating on the surface.

[0011] The method for reducing graphene oxide on the surface of polyester fibers is as follows: In an oxygen-free environment with a temperature of 127°C-200°C, graphene oxide is reduced by high-temperature vapor of hydroiodic acid for a reaction time of 0.5h-2h. This step involves reducing graphene oxide on the surface of polyester fibers to obtain graphene, thereby coating the surface of the polyester fibers with a layer of graphene. Taking advantage of the dual hydrophobic properties of graphene, the modified anti-fouling protective fiber surface has good hydrophobic and oleophobic properties, thus enabling the nonwoven fabric prepared from the anti-fouling protective fiber to have good anti-fouling effect.

[0012] The beneficial effects of this invention are: 1. This invention forms a micro-nano rough surface on the surface of polyester fibers through alkali reduction treatment, which enhances the anchoring force of graphene. In addition, the alkali solution partially hydrolyzes the ester bonds on the surface of polyester fibers to generate carboxyl and hydroxyl groups, thereby improving the surface activity of polyester fibers. Isocyanate crosslinking precisely bridges the active sites of graphene oxide and polyester fibers. Then, GO is reduced in situ by high-temperature hydroiodic acid vapor to form a dense graphene coating layer, which endows the fiber surface with superhydrophobic / oleophobic properties.

[0013] 2. The present invention constructs a micro-protrusion structure on the surface of GO-coated fibers to synergistically improve hydrophobicity. Detailed Implementation

[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0015] Example 1 The gloves are made of non-woven fabric and are designed with layers of fibers of different properties. The outer layer is made of the prepared anti-fouling and protective fiber (40 g / m²). 2 The middle layer is made of polypropylene spunbond nonwoven fabric (basis weight 20g / m²). 2(To improve tensile strength); the inner layer is made of cotton fiber spunlace nonwoven fabric (basis weight 30g / m²). 2 (Skin-friendly and breathable).

[0016] The three-layer material is hot-rolled and laminated (roller temperature 130℃, pressure 0.8MPa, speed 5m / min); it is then cut into film, molded into gloves, and ultrasonically sealed at the edges.

[0017] The preparation method of the anti-fouling protective fiber is as follows: Step 1: Alkali reduction treatment of polyester fibers Prepare a 3 wt% NaOH solution, heat it to 70℃, and then add the polyester fiber to completely impregnate it for 15 minutes. Remove the fibers, wash them with deionized water until neutral, and dry them at 60°C. Step 2: Graphene oxide coating Graphene oxide was dispersed in N,N-dimethylformamide (DMF) at a concentration of 5 g / 100 mL; Add isocyanate (25% of the mass of graphene oxide), stir to dissolve, and then add the fiber treated in Step 1; The mixture was ultrasonically reacted at 70℃ for 3.5 hours, filtered, and then dried at 50℃. Step 3: Polymer emulsion modification Prepare an acrylate monomer emulsion (prepolymer content 15%). Add the fiber obtained in Step 2, add potassium persulfate initiator (1% by mass of monomer), and polymerize at 80℃ for 1 hour; Let stand for 15 minutes, filter and wash, then dry at 55℃; Step 4: Graphene oxide reduction treatment The fiber is placed in a closed reactor, and nitrogen gas is introduced to remove oxygen. Hydroiodic acid vapor was injected and treated at 160°C for 1 hour to obtain graphene-coated anti-fouling fibers.

[0018] Comparative Example 1 The preparation method of antifouling protective fiber is as follows: Step 1: Alkali reduction treatment of polyester fibers Prepare a 3 wt% NaOH solution, heat it to 70℃, and then add the polyester fiber to completely impregnate it for 15 minutes. Remove the fibers, wash them with deionized water until neutral, and dry them at 60°C. Step 2: Polymer emulsion modification Prepare an acrylate monomer emulsion (prepolymer content 15%). Add the fiber obtained in Step 2, add potassium persulfate initiator (1% by mass of monomer), and polymerize at 80℃ for 1 hour; Let stand for 15 minutes, filter and wash, and dry at 55℃ to obtain graphene-coated anti-fouling fibers.

[0019] Comparative Example 2 The preparation method of the anti-fouling protective fiber is as follows: Step 1: Alkali reduction treatment of polyester fibers Prepare a 3 wt% NaOH solution, heat it to 70℃, and then add the polyester fiber to completely impregnate it for 15 minutes. Remove the fibers, wash them with deionized water until neutral, and dry them at 60°C. Step 2: Graphene oxide coating Graphene oxide was dispersed in N,N-dimethylformamide (DMF) at a concentration of 5 g / 100 mL; Add isocyanate (25% of the mass of graphene oxide), stir to dissolve, and then add the fiber treated in Step 1; The mixture was ultrasonically reacted at 70℃ for 3.5 hours, filtered, and then dried at 50℃. Step 3: Graphene oxide reduction treatment The fiber is placed in a closed reactor, and nitrogen gas is introduced to remove oxygen. Hydroiodic acid vapor was injected and treated at 160°C for 1 hour to obtain graphene-coated anti-fouling fibers.

[0020] Verification experiments and data The water contact angle and oil contact angle of the fiber surface were measured, with the oil contact angle measured using n-hexadecane. The test results are shown in the table below: sample Water contact angle Oil contact angle Example 1 141±3 128±2 Comparative Example 1 108±2 97±3 Comparative Example 2 127±2 116±3 As can be seen from the data in the table above, this application significantly increases the hydrophobic and oleophobic properties of the fiber surface by performing surface modification treatment on the antifouling protective fiber, thereby achieving a good antifouling effect.

[0021] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A manufacturing process for a stain-resistant protective glove, wherein the glove is made of multiple layers of nonwoven fabric, the outermost layer of which is a stain-resistant protective layer; said stain-resistant protective layer is made of stain-resistant protective fibers; characterized in that, The method for preparing the antifouling protective fiber is as follows: Step 1: Reduce the weight of polyester fibers by applying an alkaline solution, then wash them with deionized water and dry them for later use. Step 2: Prepare graphene oxide dispersion, then add isocyanate to graphene oxide dispersion, stir to dissolve isocyanate, add polyester fiber obtained from step 1 after drying, and react at a temperature of 60-80 degrees Celsius for 3-4 hours. After the reaction is complete, the solid and liquid are separated, and the resulting fiber material is drained and then dried at a temperature of 40-65 degrees Celsius. Step 3: Prepare the polymer monomer emulsion. Add the polyester fiber prepared in Step 2 to the polymer monomer emulsion, and then add the initiator to the polymer monomer emulsion. After the polymer monomer emulsion has completed polymerization, let it stand for 10-20 minutes. Then filter and take out the fiber material. After draining, wash and dry the fiber material with deionized water. Step 4: Reduce the graphene oxide on the surface of the polyester fiber prepared in Step 3 to obtain graphene, thereby obtaining a stain-resistant and protective fiber with graphene coating on the surface.

2. The manufacturing process of the anti-fouling protective glove according to claim 1, characterized in that, The specific method for reducing the weight of polyester fibers using alkaline solution is as follows: Prepare a sodium hydroxide solution with a mass concentration of 1%-5%, then heat it to 60-80 degrees Celsius, add polyester fibers, and impregnate for 10-20 minutes.

3. The manufacturing process of the anti-fouling protective glove according to claim 1, characterized in that, The reaction process in Step 2 is carried out under ultrasonic conditions.

4. The manufacturing process of the anti-fouling protective glove according to claim 1, characterized in that, The dispersion medium for the graphene oxide dispersion is N,N-dimethylformamide, and the concentration of graphene oxide is 3-6.8 g / 100 mL.

5. The manufacturing process of the anti-fouling protective glove according to claim 4, characterized in that, The amount of isocyanate added is 16%-35% of the weight of graphene oxide.

6. The manufacturing process of the anti-fouling protective glove according to claim 1, characterized in that, The polymer emulsion formed after polymerization of the polymer monomer emulsion has a solid content of 10%-20%.

7. The manufacturing process of the anti-fouling protective glove according to claim 4, characterized in that, The method for reducing graphene oxide on the surface of polyester fibers is as follows: In an oxygen-free environment with a temperature of 127°C to 200°C, graphene oxide is reduced by high-temperature vapor of hydroiodic acid for a reaction time of 0.5 h to 2 h.